Device for pumping air or other fluid.



G. W. NYQUIST. DEVICE F05 PUMPING AIR 0R OTHER PLUIE.

APPLECATION NHSB SEPT. lf Mia SHEETf-SHEET l.

G. W. NYQUIST. DEVICE FOR PUMPING AIR 0R OTHER FLUID.

APPLICATION FILED svPT Is, 191x,

1,078,870. Patente@ Nov. 1.1, 1913.

figg. f Ey.

lFig is a sectional view '2. Fig/7 is an end elevation viewed from 4endmembers :12

pivrran srATns GUSTAF W. N'YQUIST, OF MINNEAPOLIS, MINNESOTA.

DEVGE F911, PUMPING YR kHR OTHER FLUID.

Specification of Letters IPatent.

Patented Nov. 18, 1913.

Application filed September 18, 1912. Serial No: 720,984.

To all whom it may concern: y

Be it fknown that I, GUsrAr W. NYQUIST, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements in Devicesfor Pumping Air or other Fluid, of which the following is aspecification.

My invention relates to a centrifugal device for pumping air or otherfluid.

It is the object of my invention to provide rotating means for drawingin air or other fluid and forcing the same at high pressure therefrom,said means being provided with valve mechanism which shall be effectiveto absolutely seal the pump from back pressure of the pumped fluid intothe air chamber.

It is also an object of my invention to rovide a device of the abovetype which s all be simple in construction andoperation and peculiarlyavailable for lubrication.

The full objects and advantages of my invention will appear inconnection with Vthe vdetailed description thereof and are particularly4pointed out in the claims.

'In the drawings, illustrating the application of imy invention in oneform, Figure 1 is a side elevation with some parts broken away. Fig. 2is a central longitudinal section. Fig. 3 isa section on line 3-3 ofFig. 2. Fig. 4 is a view similar to Fig. 3 showing the `parts in aditerent position. Fig. 5 is a sectional view on line 5-5 of Fig. 1. online 6-6 of Fig.

t'he right hand side of Fig. 1.

A casing is provided comprising a central tubular portion 1() having asemitubular offset 11, said tubular portions `being bolted to and 13,respectively, the member 13 having opposite the center of 'tubularportion 10 an enlargement 14 providing a chamber 15 and an upstandingenlarged portion '16 fproviding a passageway -17 :leading from chamberl5. which passageway 17 may be connected wiih a vpipe 18, if desired.The tubular 'portions 10 and :11 are bifurcated centrally and formedwith *.ianges, as indicated at 2O and 21 in Figs. 1 `and 2, a centrallybifurcated ning 22 divid- 'ingthe vchamber within portion 11 into twosections 'and having a portion 23 extended within the chamber formedwithin the tubular portion 10 fpra vpurpose later to be given.

.Journaled within the end menfibers 12 and 13 and extending throughdiaphragm -ring 22 centrally with respect to the chamber within portion11 is a shaft 19 having thereon a rotary Yvalve member 24, which is a`closed cylinder provided with a semicircular cut-out portion 25 at oneside, a chamber 26 at the other side being cored out from the body ofthe cylinder to balance the weight of the same for driving purposes. Thevalve member 24 is placed at one side only of diaphragm ring 22, asclearly shown in Fig. '2. On the other side of diaphragm 22 'is securedto vshaft 19 a member 27 similar to member 24 excepting that it isprovided with an open portion -28 en the opposite side of the shaft 19from open portion 25. A cylinder .member 29 ^has an open tubularextension 30 journaled in a bearing 31 formed in end wall 12. Saidmember 29 has securedto the opposite and thereof a shaft 32 to which apulley driven from Va source of power ymay be at- -tached and thetubular portion 30 is provided with a gear 33 ineshing with the pinion34 on shaft 19 so that the members 24 and 27 on shaft L9 and member 29will be simultaneously driven inopposite directions. In practice,members 24 and 27 will be of smaller diameter than member 29, and therelation of gears -33 and 34 is such that one rotation of gear 33 will'produce one rotation of gear 34. The member 32 is provided with a 'pairof curved partitions 35 and 36 forming two chambers 37 and 38,respectively, chamber 37 `being terminated at a point about midway 'ofmember 29 by an end wall 39, while chamber 38 extends clear through -tothe `endet' member 29 being terminated by a partition or end wall 40.Both chambers 37 and 38 open indirectly into the chamber 15, as clearlyshown in Fig. 2. The space without'the partition walls-35 and 36 formschambers 37 and 38 but within cylinder member 29 comprises chambers 41and 42 each opening into a common portion 43 which in turn hascommunication with the opening 44 Within bearing extension' 30 throughwhich communica-tion with the out-- side atmosphere is had by chambers41 and 42.

The member29, .as above stated, is cylindrical and seats within thecircular opening in the diaphragm i the wall 10 a distance equal to therinner I projection 23 of diaphragm ring 22. Adjacent one junction ofpartition wall 35 with L the wall of member 29 yis a port 45 extending ithrough wall 29 .and into chamber 37. A

ring 22 being spaced from similar port 46 extends through wall of member29 into chamber 41, and between the ports 45 and 46 extends from member29 a wing 47 of a height sufficient to just engage lthe interior of thechamber formed by tubular member 10. At the outside of port 45 is ashort partition wall 48 extending obliquely toward wing 47, a similarpartition wall 49 extending from outside of port 46 toward wing 47, eachof walls 48 and 49 being inwardly curved and terminating short of wing47 so as to leave a passageway between said wing and the edges of theshort walls 48 and 49. As shown on Sheet l and also as indicated indotted lines at 50 in Fig. 5, at the ends ofthe wing member 47 and shortpartitions 48 and 49 are terminating walls 51 and 52. lt will be seen,there'- fore, that as wing member 47 moves about and Within the annularspace 53 between tubular member 10 and member 29, it separates saidspace into two portions one of which communicates through port 46,spaces n 41 and 43 and opening 44, with the atmos- 25 phere for intake,and the other of which communicates through port 45, passageway 37,chamber 15 and passageway 17, with the outow'pipe 18. As shown in Fig.6, the ends of passageways or chambers 41 and 42 adjacent chamber 15 areclosed by end walls 54 and 55 so that there can be communication betweenchambers 37 and 41 only indirectly through ports 45 and 46 and annularspace 53. A wing member 56, having end walls 57 and 58 and associatedports and short curved partitions similar to ports 45 and 46 andpartitions 48 and 49, is provided in relation to chamber 38 which is inall respects similar to the wing member47 and associated parts forchamber 37 except that wing member 56 and its relatedparts arepositioned on the opposite' side of member 29 and so as to operate atthe other side of diaphragm ring 22. Wing member 47 cooperates with thecut-out portion 25 of rotary valve member 24 While wing member,

56 coperates with the similar portion 28 of valve member 27. Theoperation of my pump will be apparent from the description thereof. Asmem-I ber 29 is rotated wing members 47 and 56 travel within the annularspaces 53 at cath side of diaphragm 22. The valve members 24 and 27 sealup the annular passageways 53 in front of and behind the wing members 47and 56. vAir or fluid in front of lsuch Wing members therefore is forcedover the lips 48 through ports 45 into chambers 37 and 38 and frm saidchambers into chamber 15l and through passageway 17 out of pipe 18. Atthe same time air or fluid will flow in throughintake opening 44,chamber 43, passages 4l and 42 through portsv 46 into the annularpassageways 53 behind wings 47 and 56. As above stated, the members 24and 29 are rotated at the same speed so that wing members 47 and 48 willin turn be brought within the openings 2 5 and 28, respectively, to varythe relation of the charge of' air in the annular passageways 53 at theend of each revolution of Wing members 47. The short curved lips orpartitions 48 and 49 enter the openings 25 and 28 in such manner aseffectually to seal communication between the high pressure area withinpassages 37 and 38 and the air pressure area with passages 41 and 42while this change is taking place, one or the other of lips 48 and 49always being in engagement with an edge of the walls forming theopenings 25 or 28. The member 24'runs in close contact with the innerwall of tubular portion 11 and also in Contact with the wall of tubularvmember 29. Itv is desirable, not only for the purpose of efectingsmoothrunning of the parts and little friction, but also to more` effectivelyseal the parts against leakage, that the members 24 and 27 should belubricated. lThis can readily be effected by applying a grease cup 59,as indicated in Fig. 5, by

means of which hard loil or other lubricant may be forced inupon thesurfaces of members 24 and 27.

The advantages of my improved pump will be apparent. Not only can highpressure be obtained or very rapid How of fluid, but by reason of thedouble character of the pump mechanism a high rate of speed may bemaintained at a relatively low ratev of power. Moreover, the device ispeculiarly compact so that a very large pumping efficiency is obtainablefrom a machine of comparatively small size.

I claim:

1. A centrifugal pump comprising a casing formed with a centralcylindrical chamber, a hollow cylinder of less diameter than saidchamber rotatably mounted therein, one of the bearings of said cylindercomprising a tubular member in communication with the outer atmosphere,said casing also providing an outlet chamber at the other end of and ofsubstantially the same diameter as the hollow cylinder, a. system ofpartitions dividing the hollow cylinder'into two pairs of oppositelypositioned passages, one of said pairs of passages having directcommunication with the inlet opening only and the other pair of paageshaving direct communication with the outlet chamber only, a partitionabout the hollow cylinder dividing the annular space between the wallsof the same and the casing into two separated compartments, openingsbeing provlded from one of each of said pairs of passages into each ofsaid compartments, said sets of openings being at opposite ends andsides of the hollow cylinder, and locking wings on the cylinder betweensaid respective pairs of openings.

2. A centrifugal pump comprising a cas ing formed with a centralcylindrical chamber, a hollow'cylinder of less diameter than saidchamber rotatably mounted therein, an inlet opening to the hollowcylinder at one end thereof, said casing also providing an outletchamber at the other end of and of substantially the same diameter asthe hollow cylinder, a system of partitions dividing the holllowcylinder into two pairs of oppositely positioned passages, one of saidpairs of passages having direct communication with the inlet openingonly and the other pair of passages having direct communication with theoutlet chamber only, a partition about the hollow cylinder dividing theannular space between the walls of the same and the casing into twoseparated compartments, openings .being provided from one of each ofsaid pairs of passages into each of said compartments, said sets ofopenings being at opposite ends and sides of the hollow cylinder, andlocking wings on the cylinder between said respective pairs of openings.

3. A centrifugal pump comprising a tubular chamber, a rotary memberwithin said chamber having the walls thereof `spaced from the walls ofthechamber and being provided vvith separated intake and outflowpassages having ports Communicating V'with the space between therotating member and the chamber, a centrifugai mmbei of less'diameterthan the first named rotary. member having a portion thereof extendinginto the aforesaid space and engagin with its periphery the periphery ofthe `rst named r0- tating member, means for rotating theA two members atuniform speeds, a wing device on the first named rotating member locatedbetween the openings into the passages therein and extending outwardlyinto engagement with the inner wall of the chamber, said second rotatingmember having a semi-circular cavity for receiving and permitting thepassage of the wing member, and a pair of short curved lips extendingfrom the outside of said openings toward the outer edge of said wingmember for entering said cavity before and after the passage of the wingmember and engaging lthe outer edges only of said cavity.

In testimony whereof I aflix my signature in presence of two witnesses.

GUSTAF W. NYQUIST. Witnesses:

F. A. WHITELEY, H. A. 'BowMArL

